package com.atguigu.gulimall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.TO.mq.OrderTo;
import com.atguigu.common.TO.mq.StockDetailTo;
import com.atguigu.common.TO.mq.StockLockedTo;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.ware.Vo.OrderItemVo;
import com.atguigu.gulimall.ware.Vo.OrderVo;
import com.atguigu.gulimall.ware.Vo.SkuHasStockVo;
import com.atguigu.gulimall.ware.Vo.WareSkuLockVo;
import com.atguigu.common.exception.NoStockException;
import com.atguigu.gulimall.ware.entity.WareOrderTaskDetailEntity;
import com.atguigu.gulimall.ware.entity.WareOrderTaskEntity;
import com.atguigu.gulimall.ware.feign.OrderFeignService;
import com.atguigu.gulimall.ware.feign.ProductFeignService;
import com.atguigu.gulimall.ware.service.WareOrderTaskDetailService;
import com.atguigu.gulimall.ware.service.WareOrderTaskService;
import com.rabbitmq.client.Channel;
import lombok.Data;
import org.apache.commons.lang.StringUtils;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.ware.dao.WareSkuDao;
import com.atguigu.gulimall.ware.entity.WareSkuEntity;
import com.atguigu.gulimall.ware.service.WareSkuService;
import org.springframework.transaction.annotation.Transactional;


@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {
    @Autowired
    WareSkuDao wareSkuDao;
    @Autowired
    WareOrderTaskService orderTaskService;
    @Autowired
    WareOrderTaskDetailService orderTaskDetailService;
    @Autowired
    ProductFeignService productFeignService;
    @Autowired
    RabbitTemplate rabbitTemplate;
    @Autowired
    OrderFeignService orderFeignService;
    @Autowired
    WareOrderTaskService wareOrderTaskService;

    /**
     * 1、库存自动解锁
     *  下单成功,库存锁定成功,接下来的业务调用失败,导致订单回滚
     *  之前的锁定的库存就要自动解锁
     * 2、订单失败
     * 库存锁定失败
     */


    private void unLockStock(Long skuId,Long wareId,Integer num,Long taskDetailId) {
        //库存解锁
        wareSkuDao.unlockStock(skuId,wareId,num);
        //更新库存工作单的状态
        WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity();
        entity.setId(taskDetailId);
        entity.setLockStatus(2);
        orderTaskDetailService.updateById(entity);
    }

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        //skuId: 1
        //wareId: 2
        QueryWrapper<WareSkuEntity> queryWrapper = new QueryWrapper<>();
        String skuId =(String) params.get("skuId");
        if(!StringUtils.isEmpty(skuId)){
            queryWrapper.eq("sku_id",skuId);
        }
        String wareId = (String) params.get("wareId");
        if(!StringUtils.isEmpty(wareId)){
            queryWrapper.eq("ware_id",wareId);
        }

        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                queryWrapper
        );

        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        //1.判断如果还没有这个库存
        List<WareSkuEntity> entities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id",skuId).eq("ware_id",wareId));
        if(entities.size() == 0 || entities == null){
            WareSkuEntity skuEntity = new WareSkuEntity();
            skuEntity.setSkuId(skuId);
            skuEntity.setStock(skuNum);
            skuEntity.setWareId(wareId);
            skuEntity.setStockLocked(0);
            //远程查询sku的名字
            //TODO 远程查询sku的名字 ,如果失败整个事务不需要回滚
            //1、自己catch异常
            try{
                R info = productFeignService.info(skuId);
                Map<String,Object> data = (Map<String, Object>) info.get("skuInfo");
                if(info.getCode() == 0){
                    skuEntity.setSkuName((String)data.get("skuName"));
                }
            }catch (Exception e){

            }
            wareSkuDao.insert(skuEntity);
        }
            wareSkuDao.addStock(skuId,wareId,skuNum);
    }

    @Override
    public List<SkuHasStockVo> getSkuHasStock(List<Long> skuIds) {
        List<SkuHasStockVo> collect = skuIds.stream().map(skuId ->{
            SkuHasStockVo vo = new SkuHasStockVo();
            //查询当前sku 的总库存量
            //SELECT SUM(stock-stock_locked) FROM `wms_ware_sku` where sku_id = 1
            Long count = baseMapper.getSkuStock(skuId);
            vo.setSkuId(skuId);
            vo.setHasStock(count==null?false:count>0);
            return vo;
        }).collect(Collectors.toList());
        return collect;
    }

    /**
     * 为某个订单锁定库存
     * rollbackFor = NoStockException.class
     * 默认只要是运行时异常都会回滚
     * @param vo
     * @return
     */
    @Transactional(rollbackFor = NoStockException.class)
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {
        /**
         * 保存库存工作单的详情
         * 追溯
         */
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        orderTaskService.save(taskEntity);
        //1、按照下单的收货地址.找到一个就近的仓库,锁定库存
        //1、找到每个商品在哪个仓库都有库存
        List<OrderItemVo> locks = vo.getLocks();
        List<SkuWarehasStock> collect = locks.stream().map(item -> {
            SkuWarehasStock stock = new SkuWarehasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            //查询这个商品在哪里有库存
            List<Long> wareIds = wareSkuDao.listWareIdHasSkuStock(skuId);
            stock.setWareId(wareIds);
             return stock;
        }).collect(Collectors.toList());
        System.out.println("库存"+collect);
        //2、锁定库存
        for (SkuWarehasStock hasStock : collect){
            Boolean skuStocked =false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();
            if(wareIds == null || wareIds.size() == 0){
                //没有任何仓库有这个商品的库存
                System.out.println("没有任何仓库有这个商品的库存");
                throw new NoStockException(skuId);
            }
            for (Long wareId:wareIds) {
                //成功返回1,否则返回0
                Long count = wareSkuDao.lockSkuStock(skuId,wareId,hasStock.getNum());
                System.out.println("库存查询修改结果"+count);
                if(count == 1){
                    skuStocked = true;
                    //TODO 告诉MQ库存锁定成功
                    WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity(null,skuId,"",hasStock.getNum(),taskEntity.getId(),wareId,1);
                    orderTaskDetailService.save(entity);
                    StockLockedTo lockedTo = new StockLockedTo();
                    lockedTo.setId(taskEntity.getId());
                    StockDetailTo stockDetailTo = new StockDetailTo();
                    BeanUtils.copyProperties(entity,stockDetailTo);
                    //只发id不行,防止回滚后找不到数据
                    lockedTo.setDetail(stockDetailTo);
                    rabbitTemplate.convertAndSend("stock-event-exchange","stock.locked",lockedTo);
                    break;
                }else{
                    //当前仓库锁失败,重试下一个仓库
                }
            }
            if(skuStocked == false){
                //当前商品所有的仓库都没有锁住
                throw new NoStockException(skuId);
            }
        }
        //3、肯定全部都是锁定成功的
        return true;
    }

    @Override
    public void unlockStock(StockLockedTo to) {

        //获得库存工作单的id
        StockDetailTo detailTo = to.getDetail();
        Long detailId = detailTo.getId();
        //解锁
        //1、查询数据库关于这个订单的锁定库存信息
        //有：证明库存锁定成功了
        //解锁:订单情况
        //     1、没有这个订单,必须解锁
        //     2、有这个订单,不是解锁库存
        //         订单状态: 已取消,解锁库存
        //                  没取消,不能解锁库存
        //没有,说明库存锁定失败了,库存回滚了,这种情况无需解锁
        WareOrderTaskDetailEntity byId =  orderTaskDetailService.getById(detailId);
        if(byId!=null){
            //解锁
            Long id = to.getId();
            WareOrderTaskEntity taskEntity = orderTaskService.getById(id);
            String orderSn = taskEntity.getOrderSn();// 根据订单号查询订单状态
            R r = orderFeignService.getOrderStatus(orderSn);
            if(r.getCode() == 0){
                //订单数据返回成功
                OrderVo data = (OrderVo) r.getData("data", new TypeReference<OrderVo>() {});
                if(data == null || data.getStatus() == 4){
                    //订单已经被取消,才能解锁库存
                    if(byId.getLockStatus() == 1){
                        unLockStock(detailTo.getSkuId(),detailTo.getWareId(),detailTo.getSkuNum(),detailId);

                    }
                }
            }else{
                //消息拒收以后重新放到队列里面,让别人继续消费解锁
                throw new RuntimeException("远程调用失败");
            }
        }else{
            //无需要解锁
        }
    }

    //防止订单服务卡顿,导致订单状态消息一直改不了,库存消息优先到期,
    // 查订单状态新建状态,什么都没做就走了
    //导致卡顿的订单,永远不能解锁库存
    @Transactional
    @Override
    public void unlockStock(OrderTo orderTo) {
        String orderSn = orderTo.getOrderSn();
        //查询一下最新的库存解锁状态,防止重复解锁库存
        WareOrderTaskEntity orderTaskEntity = wareOrderTaskService.getOrderTaskOrderSn(orderSn);
        //按照工作单的Id找到所有的没有解锁的库存,进行解锁
        Long id = orderTaskEntity.getId();
        List<WareOrderTaskDetailEntity> entities = orderTaskDetailService.list(
                new QueryWrapper<WareOrderTaskDetailEntity>()
        .eq("task_id",id).eq("lock_status",1));
        for (WareOrderTaskDetailEntity entity : entities){
            unLockStock(entity.getSkuId(),entity.getWareId(),entity.getSkuNum(),entity.getId());
        }
    }


    @Data
    class SkuWarehasStock{
        private Long skuId;
        private List<Long> wareId;
        private Integer num;
    }

}